Back fire arrester for combustible gas conduits



June 16, 1931.

C. H. BICHLER BACK FIRE ARRESTER FOR COMBUSTIBLE GAS CONDUITS Fii ed Dec. 27. 1927 2 Sheets-Sheet '1 Fig.5 Fig.6 F1 1 Fig.3 Fig.9

INVENTOH Charles HB (C/lie? A 7 TOR/V5 y June 16, 1931. c, E 1,810,814

BACK FIRE ARRESTER FOR COMBUSTIBLE GAS CONDUITS Filed Dec. 27, 19 27 2 Shep ts-Shet 2 Fig. 10

Fig. 12

/9 Fig. 11

- //VVE/VTO/? Charles Hflichler A T TOR/VEV Patented June 16, 1931' ;,;umTED ST S PATENT CHARLES HENRI BICHLER, or Penis, rnencn, ASSIGNOR TO THE r niaam sncnnirn,

j -on'rAnIs, FRANCE 7 i r nntnzrmn en-nnsrnn r03 c-oiirBUs'rIBLn eAscoNDUI'rs Application filed December 2'7, 1927, Serial No. 242,866, and in France January 7,1927.

7 My invention relates to the prevention of back firing in combustible gas conduits, by means of suitable channels or groups of channels, preferably parallel, which are pro.-

7 vided in said conduits. The use of this device in the intake manifolds of internal combustion engines is especially advantageous. v

One object of my said invention, comprises 1I1COIIlb1IlLt1OI1, a. combustible gas conduit whose diameter is slightly greater than is usual," and strips or sets of strips which are rigidly held in a suitable relative posi;

tion. in the said conduit, said device serving to prevent all back firing 'or'entrance' of flames, from whatever cause, into the gas.

supply holder or tank, whereby all accidents from'this source will be prevented." V Another object ofjthe said invention-is to 2 holdtog'ether, the said strips with suitable spacing, by means ofbolts or like members which are provided with suitable cross-- 1 pieces or spacing members said strips be-' ing preferably secured at :one end to a flangeor collar which is attached by suitable means to a desired point on the suction piping.

Another object of said invention is to ar-- range the said bolts not in the interior of the set of strips, but at the ends of this set, in order tolprevent all reduction ofth'e- 2', comprises in its interior a "set of strips flowsection'for the gasi r eddies produced by said members in the moving combustible gas, which fobject is. attained in providing, on sald members;

Y l' l-- ot berances for reventin Stream Pr u p J serted into the aperturesilO forme'din the,

the said gases. from' eddying;

of being provided inthe middle part of the strips, are arranged at, or nearthe periph cry of the bundles of'strips, thus completely the invention, 5 mounted placed inthe admission conduit,

. freeing the middle part or center of thev pipe, with a view to considerably reduce :sent various embodiments of the invention:

glne embodying my inventlon,

F'g'. 2. a detail view, l laxlal fsection,

showing the admission conduitaccording-to' shown in Fig.1,g1 i ,c i F g. 3 1s a side viewof the same, Flg. 4 is an end view of the sets of strips Figs. 5 to}? show verticalsectionalyviews, of variously perforated strips, herieinafter more fully described,

Fig. 10 is an elevational strips disposed in "a combustible gas conduit, whichis shown in section, r

Fig. 11 is a side view; of a separate-set of strips, with reference to Fig; 10, ,i

Fig. 12,is,a v'ertical'cr'j'ss sectional view of a spacing member, u ,1

Fig. 13 is'an end view showing an arrangeupon the engine viewof a set of ment of the spacing members near the periphery of the bundle ofstrips. a

In accordance withltheinventiomeach of the gas admission conduitspomprises two parts 3 and 4 which are connected together by an elastic sleeveb consisting.forinstance of india rubber or the like. In my invention, one-of the parts ofthe said admission conduit. and preferably the part 4=which is directly connected with the cylinders land consisting of elements-of a suitably different width which are held together by the 7 Moreover, Said Spacing mmber's, instead, bosses 11 on the conduits. 4:, sa1d*bosses.be--

the spacing of the'saidstrips will depend I I I upon the type of conduit in which they are employed and uponfthe' fuel utilized, and

upon other factors. i 1 'The strips 6,.fare. connected together by,

the bolts'7- provided with'spacin members: I

8 which are mounted between {the several stripsso as to ,p'roperl-yyspacezthem apart;

The bolts 7 are employed in any suitable number, and the width of the strips 6 progressively increases, as observed chiefly in Figs. 2 and 480 that their lateral edges will be in tangential contact with their supporting sleeve'or -with -the wall of the gas conduit in which they are-disposed.

In these various constructions, the setsof strips may be placed in .an adjustablev position in the interior of the gas conduits.

I may for instance bring the set of strips at any desired instantinto the best position for the results to be obtained, and this adjustment may be employed with equal facility for strips situated in gas conduits whether under suetion or pressure.

The dimensions of my device will of course-vary'with the" size ofthe gasconduit with-which Eit-is used. I

*The' setsof strips '6, may be secured in the gas conduit 4 by a bolt passing-through suit able cross-pieces or spacing membersin such manner that the bolt will also guide the. saidcross-pieces, and in this case one of'the bolts 7 might "be dispensed with; Thestrips of the-set 6 may consist of any suitable sub- I stance, but I preferably employ a good heatconducting metal, and the strips maybe suitably polished toofler a minimum of resist r ance to the functioning ofthe conduit. The

said strips may bejperforated, and this may be effected by the punching process as shown in Fig 5, the'wall of the holes being per pendicular to the faces of the strips: 'but'in order to prevent any opposition to the flow of the gas due to the suction of the engine,

which might" be occasioned by the impact of the gas upon the surfaces perpendicular to-the flow, I provide sharp edges for the holes by the operation of countersinking which is performed on both faces as shown in Fig.)6, or on a single face as shown in Fig. 8, or by piercing said holes'in an in'- clined direction as shown in Fig. 7 or by forming-a thin edge or tongue at one side 1 oflthe hole as shown in Fig. 9, said tongue: preferably extending inithe contrary direction to the flow of gas.

The number of perforations may-vary according to the purposefor which the ap paratusisutilized, and according to the par-j ticular conditions of'eachc a'se. i

As shown" in Figs 10 and 11, strips (Storming the protecting set which prevents back firing are provided at each end with lugs 161and 17 for :the insertion of'respec tiye bolts 18 separated by spacing members 190i proper size since the lugs 16 and 17 are formed at the ends of the strips,

the bolts 1 8securingthesaid strips will be situated outside the set of strips and wil not diminish the flow section for the gas, and I-thus. appreciably reduce the prejudice which is offered bythe device to the func tieni-ng of the engine, and the normal-power 3i I In order to avoid of the engine will thus be practically maintained. r

The lugs 16 and 17 may have any desired form and may be employed in any suitable number, and into each lug I may; insert two or more bolts if the stripsare to bemore rigidlyheld-together,it is obvious that the said bolts are in all cases disposed outside of the setof strips. v

k as completely as pos- 'sible the' eddying of gases near the spacing members 19, the said members are provided as in 12 with projections 20," the ends 2110f which, receivingqt-he;impact of combustible gases which flow in the direction, of the' arrowi F in Fig. 12, are'of' a Convenientlyi-rounded -crosssection, with --a shape similar J to that of the entrance edge of an; aeroplane wing' The rear ends 22 of said projections are Wedge-shaped, and

linejfor preventing the gases endina sharp from eddying. 7 1 V N My preferred arrangement is shown in Fig. '18, wherein order to allowthe speed of gases'to befstill higher, the central-part of'the gas pipe'iscleared by arranging the spacing members together with their bolts from-this source, such IZLS melting of the pipes, loosening of the brazed flanges or joints, and the'llike, but. it is obvious that the said sets of strips may be placed at any point along the admission piping;

The device herein described may be uti-v lized as a fire-arrester in any combustiblegas conduit; but 'it :is especially useful in the intake manifoldslof, internal combuss tionengines, though. I do .not wish to 'be limitedto its use therein.

.WhatIclaim'isz-r 2' r :In a combustible gas conduit; a backfire Varreste'r comprising an elongated bundle of spaced parallel strips inserted lengthwise, in the conduit, the-strips being provided with bolts passing. through openings :near

their ends, elongated spacingfmnibers boltedlbetween the strips, and said spacing I members having a rounded front end and a wedgesshaped rear end.

Intestimo'ny whereof I have hereunto set Paris: this tenth day of Decemmy a t. be: 1927.

- CHAIR-LES HENRIWBIGHLER; 

